Carbon-scraper



A B. SEPPMANN.

CARBON SCRAPER.

APPLICATION FILED MAY 5, 1921 11. w @AH @D Pa'tenmdi. [mg-w 1H m 3110214 Tot fiwmwwam w/ m I y w WWW UNITED STATES PATENT OFFICE.

CARBOI-BCRAIPER.

Application filed May 5,

T 0 all whom it may concern Be it known that I, ALFRED BRUNO Sare- MANN,a citizen of the United States, reslding at Lake Crystal, in the countyof Blue Earth, State of Minnesota, have invented a new and usefulCarbon-Scraper; and I do hereby' declare the following to be a full,clear, and exact description of the nvention, such as will enable othersskilled in the art to which it appertains to make and use the same.

The invention relates to carbon scrapers for scraping and removingcarbon from piston ring grooves of pistons used in internal combustionengines. Carbon forms and collects in piston ring grooves under thepiston rings, in which grooves the piston rings have considerableclearance under them to allow the rings to follow the bore of thecylinder freely. Carbon will find its Way by the rings and will form inthe bottom of the grooves gradually fillmg them in, sometimes filling inmore on one side than the other, which causes the r1ng to crowd to thatside of the cylinder and as the carbon becomes ver hard especially inthe upper ring, and as t e rings arenot the same thickness throughoutthelr circumference they tend to work around in their grooves, finallybecoming wedged between the cylinder wall and the carbon formation underthe ring. The wedging of the piston ring causes the ring to score thewalls of the cylinder as the piston plays or reciprocates against thescored walls, and 1t also becomes scored. Therefore, it is the mam obect of the invention to provide a tool by means of which the carbonformation may be quickly and easily removed from the piston ringgrooves.

A further object is to provide a carbon remover for removing carbon frompiston ring grooves, said remover comprising a handle member formed fromspring wire, which handle member is substantially U-shaped and has itsarms bent inwardly toward each other, forming groove-receiving portionsand then outwardly and inwardl and terminating in scraping members aapted to be received by the groove at points beyond a center line of thepiston drawn at a right angle to the handle member; one of said scrapingmembers being positioned to scrape the horizontal walls of the groovesand the other mefilber positioned to scrape the vertical wa s.

Specification of Letters I'atent.

Patented Aug. 23, 1921.

1921; Serial No. 467,181.

With the above and other objects in View,

the invention resides in the combination and arrangement of parts ashereinafter set forth, shown in the drawings, described and claimed, itbeing understood that changes 1n the precise embodiment of the inventionmay be made within the scope of what is claimed without departing fromthe spirit of the invention.

In the drawings Figure l is a perspective view of the conventional formof piston showing the carbon remover applied thereto.

Fig. 2 is a top plan view of the carbon remover showing the same inposition on a piston.

Fig. 3 is a front elevation of a portion of a iston showing the scraperthereon.

eferring to the drawings, the numeral 1 designates a conventional formof internal combustion piston and 2 piston ring grooves d sposedtherein. Carbon collects in the piston grooves 2 and accumulates to suchan egrtent as to crowd the piston ring to one slde or the other, or towedge the ring against circumferential movement. When this happens thebore of the cylinder becomes vertically scored or the piston is scored.When the bore or piston is so damaged loss of compression results andconsequently the efficiency of the engine is impaired. To overcome thesedifficulties, a carbon removing tool 3 is provided, by means of whichtool the carbon may be quickly and easily scraped from the walls of thepiston ring grooves 2.

The carbon removing tool 3 is formed from a single piece of spring rodbent upon itself as at 4 to form the arms 5 which at one end constitutesthe handle member 6, which handle member is adapted to be grasped by thehand of the operator for rotating or reciprocating the tool as a wholeduring a carbon removin operation. The arms 5 curve inwardly andoutwardly, thereby forming portions 7, which portlons are receivedwithin the piston ring groove 2 that is being cleaned and form means forguiding the tool during its rotation or reciprocation and preventingwobbling of the wall 9.

' wall scrapin thereby scraping scra the walls thereof when the tool "asa w ole is reciprocated. The arms 9 and 9 are referably disposed whenthe tool is aplie to a piston at points outside of a line rawn throughthe piston center at a right angle tothe handle 6. By so 'tioning thescrapin arms 9 and 9, it W1 1 be seen that the too will be maintained inposition on the piston by the s rin action thereof also that theportions% of the arms 5 W111 be maintained within the groove 2 which isbeing cleaned for guiding the tool during its rotation or re'cirocation.

By referrin to ig. 3 it will be seen that a scraper mem r 9 is dis sedin a position for scraping the up r orizontal wall 9" simultaneouslywith t e scraping of the vertical wall 9 by the scra ing arm 9,therefore it will be sewn that as t e scraper as a whole is reciprocatedor rotated that one of the horizontal walls will be scraped at the sametime that the vertical wall 9 is scraped. When it is desired to scrapethe lower horizontally disposed wall 9 of the piston oove 2, it willonly be necessary to turn t e tool over, which action will place the arm9 in en gement with the horizonta ly disposed wal 9, at which time thetoolis reciprocated or rotated,

the carbon from the vertical wall mm the lower horizontal and From theabove it will be seen that a carbon remover for a piston ring groove isprovided which is simple in construction and one formed from a singlepiece of spring material. Also that the operator may by ueezing thehandle 6 increase the ressure I o the scraping arms 9 and 9 on t e wallsof the ves when so desired.

The invention having been set forth what is claimed as new and usefulis:

1. A carbon scraper for scraping carbon from piston ring grooves ofpistons, said scraper being formed from a sin le piece of s ringmaterial bent upon itsel to form a -shaped handle, the arms of saidhandle outwardly and inwardly and terminatin in scraping elementsadapted to be received by t e piston grooves at points beyonda'diametrical line drawn at a right angle to the handle member, saidspring arms being so bent as to provide curved portions adapted to bereceived b the piston groove adjacent the handle member.

3. A carbon scraper for scraping carbon from piston grooves of pistons,sai scraper being forme from a single piece of sp material bent uponitself to form a U-sha handle, the arms of said handle exten mg inwardlytoward each other and forming portions adapted to be received by thegroove of the piston, said arms beyond the ve receiving portionsextending outw y and inwardly and terminating in scraping arms adaptedto engage in the groove, one of said scraping arms being provided with ahorizontally dis sed scraping edge adapted to scrape the orizontal wallsof the groove and a vertically disposed scraping ed carried by the otherscraping arm and pted to scrape the vertical wal of the groove.

In testimony.whereof I have signed my name to this specification in thepresence of two subscribing witn ALFRED BRUNO SEPPMANN,

Witn:

T. K. Masonic,

A- Qumsr.

